Making the change from my old Q-whatever quad core to a near top of the line system dramatically changed my game play experience.
I'm writing this especially for the people who are having problems, low and inconsistent frame rate and general doubts about the future of NS2. On the condition that UWE manages to get the same performance out of mid range machines, this game will totally rock!
It's hard to put my finger on any particular item that makes the difference. It's the whole package. The general fluidity that unlocks the NS2 experience. I can actually track my enemies now. My positional awareness has increased greatly. Even in marine vs. skulk(s) close combat situations I now know where they are and where I am, and where I should be aiming at. Enemies no longer warp across the screen and I no longer lose sight of them because too many frames were skipped. After a short time of adaption to the high frame rate my k/d ratio skyrocketed. Clearly I benefited from exploiting the low performance others have. But even when that is accounted for I still feel like I'm in control now and no longer subject of arbitrary fps hitches and choppy movement.
Movement in general feels different, more fluid, almost HL-ish. As long as the server is doing well at least. I feel like I can jump higher and farther. Maybe that's not actually the case but at least it feels like that. It's much more precise and crisp at any rate. I now jump over boxes and rails that I used to walk around. Because I don't get stuck on them any more. It's a joy.
So what I want to say here is that NS2 at its core has what it takes. The "Natural Selection"-experience is there. It's close to flawless. They just have to "unlock" it for the average gamer. They need to optimize it so it runs with the same performance on a mid range system as it's running on high end machines now. The potential is there. Please make it happen.
This is the kind of thing that goes on behind close doors on normal game releases, where they are optimizing it right up until the end. You guys are just getting to play with a version of the game that normally only the developers see.